<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card class="cards">
      <!-- 按钮 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog"
            >添加分类</el-button
          >
        </el-col>
      </el-row>

      <!-- 表格区域 -->
      <tree-table
        class="marTop"
        :data="cateList"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        border
      >
        <!-- 是否有效 -->
        <template #isok="scope">
          <i
            class="el-icon-success"
            style="color: lightgreen"
            v-if="scope.row.cat_deleted === false"
          ></i>
          <i class="el-icon-error" style="color: red" v-else></i>
        </template>

        <!-- 排序 -->
        <template #order="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag
            type="success"
            size="mini"
            v-else-if="scope.row.cat_level === 1"
            >二级</el-tag
          >
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>

        <!-- 操作 -->
        <template #opt="scope">
          <el-button
            type="primary"
            icon="el-icon-edit"
            size="mini"
            @click="showOptDialog(scope.row.cat_id)"
            >编辑</el-button
          >
          <el-button
            type="danger"
            icon="el-icon-delete"
            size="mini"
            @click="deleteCate(scope.row.cat_id)"
            >删除</el-button
          >
        </template>
      </tree-table>

      <!-- 分页区域 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes , prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>

    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      @close="addCateDialogClosed"
    >
      <!-- 添加分类的表单 -->
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>

        <el-form-item label="父级分类">
          <el-cascader
            expand-trigger="hover"
            v-model="selectedKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCateChanged"
            clearable
            change-on-select
          >
          </el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 编辑对话框 -->
    <el-dialog title="编辑分类" :visible.sync="editCateDialogVisible">
      <el-form :model="editCate" label-width="80px">
        <el-form-item label="分类名称">
          <el-input v-model="editCate.cat_name"></el-input>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="updateCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类的列表
      cateList: [],

      // 商品查询条件（接口的参数）
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },

      // 总数据条数
      total: 0,

      // 控制添加分类对话框的显示与隐藏
      addCateDialogVisible: false,

      //控制编辑分类对话框的显示与隐藏
      editCateDialogVisible: false,

      // 获取父级分类的列表
      parentCateList: [],

      // 级联选择器的配置对象
      cascaderProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },

      // 选中的父级分类的ID数组
      selectedKeys: [],

      // 为table指定列的定义
      columns: [
        {
          label: "分类名称",
          prop: "cat_name",
        },
        {
          label: "是否有效",
          type: "template",
          template: "isok",
        },
        {
          label: "排序",
          type: "template",
          template: "order",
        },
        {
          label: "操作",
          type: "template",
          template: "opt",
        },
      ],
      // 添加分类的表单数据对象
      addCateForm: {
        cat_name: "",
        cat_pid: 0,
        cat_level: 0,
      },

      // 添加分类规则，验证
      addCateFormRules: {
        cat_name: [
          { required: false, message: "请输入分类名称", trigger: "blur" },
        ],
      },

      // 存储当前编辑的分类
      editCate: [],
    };
  },

  created() {
    this.getCateList();
  },

  methods: {
    // 获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.queryInfo,
      });

      if (res.meta.status !== 200)
        return this.$message.error("获取商品分类失败！");
      console.log(res.data);
      this.cateList = res.data.result;
      this.total = res.data.total;
    },

    // 监听pagesize改变
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize;
      this.getCateList();
    },

    // 监听pageum 的改变
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage;
      this.getCateList();
    },

    // 点击显示对话框
    showAddCateDialog() {
      this.showParentData();
      this.addCateDialogVisible = true;
    },

    // 显示父级分类
    async showParentData() {
      const { data: res } = await this.$http.get("categories", {
        params: { type: 2 },
      });
      if (res.meta.status !== 200)
        return this.$message.error("获取父级分类失！");
      this.parentCateList = res.data;
    },

    // 选择项发生变化触发这个函数
    parentCateChanged() {
      if (this.selectedKeys.length > 0) {
        // 父类分类的id
        this.addCateForm.cat_pid = this.selectedKeys[
          this.selectedKeys.length - 1
        ];
        this.addCateForm.cat_level = this.selectedKeys.length;
        return;
      } else {
        // 父分类的id
        this.addCateForm.cat_pid = 0;
        // 为当前分类的等级赋值
        this.addCateForm.cat_level = 0;
      }
    },

    // 点击确定，添加新的分类
    addCate() {
      this.$refs.addCateFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.post(
          "categories",
          this.addCateForm
        );

        if (res.meta.status !== 201) {
          return this.$message.error("添加分类失败！");
        }

        this.$message.success("添加分类成功√");
        this.getCateList();
        this.addCateDialogVisible = false;
      });
    },

    // 监听对话框的关闭事件，重置表单数据
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields();
      this.selectedKeys = [];
      this.addCateForm.cat_level = 0;
      this.addCateForm.cat_pid = 0;
    },

    // 删除分类按钮
    async deleteCate(id) {
      // console.log(id)
      const { data: res } = await this.$http.delete(`categories/${id}`);

      if (res.meta.status !== 200) return this.$message.error("删除分类失败！");

      this.$message.success("分类删除成功");
      this.getCateList();
      console.log(id);
    },

    // 显示编辑分类对话框
    async showOptDialog(id) {
      const { data: res } = await this.$http.get(`categories/${id}`);
      if (res.meta.status !== 200)
        return this.$message.error("获取分类数据错误！");
      this.editCate = res.data;
      this.editCateDialogVisible = true;
    },

    // 提前更新后的分类数据
    async updateCate() {
      console.log(this.editCate.cat_id);
      console.log(this.editCate.cat_name);
      const { data: res } = await this.$http.put(
        `categories/${this.editCate.cat_id}`,
        {
          cat_name: this.editCate.cat_name,
        }
      );
      console.log(res);
      if (res.meta.status !== 200) return this.$message.error("更新分类失败！");

      this.editCateDialogVisible = false;
      this.getCateList();
    },
  },
};
</script>

<style lang="less" scoped>
.marTop {
  margin-top: 15px;
}

.el-cascader {
  width: 100%;
}
</style>